fix(admin): remove duplicate ticket dialog subtitle

Keep the ticket number and status in the sidebar only, remove the unused header description payload and bindings, and update dialog regression coverage.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

assets/js/admin-tickets.js

@@ -12,9 +12,7 @@
   var panel = detailDialog.querySelector('[data-aksrt-ticket-panel]');
   var list = root.querySelector('[data-aksrt-ticket-list]');
   var detailTitle = document.getElementById('aksrt-ticket-detail-title');
-  var detailDescription = document.getElementById('aksrt-ticket-detail-description');
   var initialTitle = detailTitle.textContent;
-  var initialDescription = detailDescription.textContent;
   var baselines = new WeakMap();
   var active = null;
   var opener = null;
@@ -179,7 +177,6 @@
       if (current !== generation || active !== detailDialog) return;
       panel.innerHTML = data.panel;
       detailTitle.textContent = data.title;
-      detailDescription.textContent = data.description;
       if (typeof data.list === 'string') list.innerHTML = data.list;
       updateUrl(id, data.page);
       setupForms(panel, restore);
@@ -225,7 +222,6 @@
   function openDetail(id, source, refresh, message) {
     ticketId = id;
     detailTitle.textContent = initialTitle;
-    detailDescription.textContent = initialDescription;
     show(detailDialog, source);
     updateUrl(id);
     return loadDetail(id, !!refresh, message || '', {});